How to wrap slick area of bus?

[akuarela]

We need to do a partial flat wrap on a bus that has a 10” approx lightly textured stone guard border on the bottom edge where part of the wrap should go. It seems to be siliconized or some other slick material and it doesn’t seem like any adhesive material would stay on.
Any of you encountered this? Would there be some kind of primer or other product to assure adhesion?
Thank you

 

[ddarlak]

Inform the client that this area cannot be wrapped and move on...

 

[akuarela]

Thanks, that's what we did